Looks at how HF radio signals are propagated via the ionosphere. Includes a description of NVIS propagation, and looks at VOACAP-based propagation prediction tools. This programme was originally recorded for use by RSGB Clubs. With the COVID-19 restrictions, I felt it would now be better released to a wider audience. Steve G0KYA
![](https://s2.save4k.ru/pic/TBO0IYXF79g/mqdefault.jpg)